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          Blender Tutorials: 608 Bearing - part 5






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Part 5 Completing the Bearing Cage 




With 608-CageA now complete its time to go back to Cage B which we copied and mirrored from cage A before the chamfers were added.

In the outliner click on 608-CageB, select the Eye icon to bring it into view and close the eye icon of 608-CageA.

When we originally mirrored the cage from 608-CageA, we effectively applied a scale factor of -1 in the Y axis. Press N to open the Transform  Properties window, You will see ScaleX:-1.000. To clear this back to ScaleX:1.000 we need to apply the scale to the object. To do this press Ctrl-A and accept "Apply Scale and Rotation". If you had simply changed the number in the Transform Properties window to 1 the cage would have flipped back to the other side of the bearing
Outliner






Select Vertices In front view select the vertices that make up the loops we cut in the bridging section between the ball cups. Shift-Alt-RMB but leave the vertices of the bottom bridging section deselected as these are parallel to the
 X axis and the easiest to modify.

With the vertex loops selected on all but the bottom section, press X to delete them
Select Edge
Zoom SW, pan Shift-MMB and rotate the view MMB, until you obtain a good viewing angle on the bottom face of the remaining bridging section. Select the central bottom face. (Shift-RMB the 4 vertices on the corner of the face.)





Not Square Switch to top view and go into wire view mode Z. you will see the selected edges are not square because they were cut from 
geometry originally created from the ball bearing's UVspheer, so we need to square up the edges.

Extrude Referance Face
select the face vertex on the outer surface of the cage and Shift-S snap Cursor/>Selection.
Select the vertex on the opposite end of the edge and Scale S constrain X to a scale point of 0. Repeat this on the other edge of the face.





Edge Angle Select one of the edges that cross the bottom face. Go to side view and wire view mode. You will see that the edge is not aligned to the Y axis, this is because of the same reasons the edge above are not square. 

Extrude E (Only Edges from sub menu) a face from this edge constrained in the Z axis. The length of the face is not important. We will use this face to see what angle the edge is at.
Set Cursor In the mesh tools 1 panel select edge angle and then select the four vertices of the face. The angle of each 
face corner will be displayed.

To form the clasp we need to spin the bottom face 92.376 degrees.

Select only the bottom two vertices and delete them X as they were there just to obtain the required spin angle.





Prepare to Spin Select one vertex on the inside edge of the bottom face and snap Shift-S Cursor->Selection to position the cursor to the centre of the spin radius.

Shift-RMB Select the other vertices of the bottom face.
Spin Face Go to side view NumPad-3.

In the Mesh Tools panel set Degr:92.376 and Step:7 and press Spin. Select all A and remove doubles W as we have also stacked 
7 vertices on either end of the edge below the  cursor.





Reselect Face Re-select the newly spun face and Extrude E (Region from sub menu) and 0.3 for the distance. When you select region a new face will be extruded constrained to an axis perpendicular to the original face.

If the face extrudes in the wrong direction press grab G constrain to Y and distance -0.6 (-0.3 to bring it back to the cursor and -0.3 for the correct position)
Extrude





Cut With the vertices of the face still selected cut a new edge across the centre of the face. K Knife (Midpoints). Two new vertices will be created.
                 New Edge
Spin Face In the Mesh Tools panel set Degr:90 and leave Step:7. Go to side view and press Spin. The next section of the clasp will be formed.
Select all A and remove doubles W to remove the vertices stacked under the cursor.

Re select the newly created face and extrude (Region) 0.2mm







Cut With the vertices of the face still selected cut a new edge across the centre of the face. K Knife (Midpoints). Two new vertices will be created.
                 New Edge
Set Cursor Select the two new vertices and delete X (Edges). The edge joining the two vertices and both faces either side will be deleted.

Select one middle vertex and snap the cursor to it.





Spin Select the two centre vertices and the two on the left edge. We will spin these in front view to form the front radius of the clasp.

In the Mesh Tools panel set Degr:180 and Spin:14, go to front view and then press Spin. 
As before select all and remove doubles.
Select Vertices Select the newly formed clasp and the four edge loops that make up the bridging section.





Set Cursor We are now going to Spin Dup the new bridging section with the clasp around the cage.

Tab into Object Mode and snap the cursor to the object centre.

Tab back into Edit Mode.

In the Mesh Tools panel set Degr:360 and Spin:7.

Press Spin Dup to copy the bridging section between the cage spheres.
Spin Dup
Select all and remove doubles.





Select Edges Its now time to add the fillet around the edges of the cage. This time the outer edge loops will also follow around the clasp.

Follow the details in Part 4 to add the Fillets but with Edge Select activated make sure you select continuous loops that also include the clasp.

Add the 0.05mm Fillets with the bevel Centre script.

Add the Edge Split Modifier also detailed in Part 4

This completes OB:608-CageB

Press Ctrl-W and save your work.

In the next section's we will add the dust shield and circlip to complete the detailed model of the 608 bearing

Completed Cage





<< 608 Part 4 The Cage Tutorials 608 Part 6 Dust Shield >>












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